diff --git a/tests/integration/test_full_workflow.py b/tests/integration/test_full_workflow.py
new file mode 100644
index 0000000..64f3465
--- /dev/null
+++ b/tests/integration/test_full_workflow.py
@@ -0,0 +1,296 @@
+"""Integration tests for ScaffoldForge."""
+
+import pytest
+import os
+import tempfile
+from pathlib import Path
+from unittest.mock import Mock, patch, MagicMock
+
+from click.testing import CliRunner
+
+from scaffoldforge.cli import cli
+from scaffoldforge.parsers import IssueParser, IssueData, ChecklistItem
+from scaffoldforge.templates import TemplateEngine
+from scaffoldforge.generators import StructureGenerator, CodeGenerator
+
+
+class TestFullWorkflow:
+    """Integration tests for the full workflow."""
+
+    @patch('scaffoldforge.cli.commands.IssueParser')
+    @patch('scaffoldforge.cli.commands.TemplateEngine')
+    @patch('scaffoldforge.cli.commands.StructureGenerator')
+    @patch('scaffoldforge.cli.commands.CodeGenerator')
+    def test_full_generate_workflow(
+        self, mock_code_gen, mock_struct_gen, mock_tpl_engine, mock_parser
+    ):
+        """Test complete generate workflow."""
+        runner = CliRunner()
+
+        mock_issue_data = Mock()
+        mock_issue_data.number = 42
+        mock_issue_data.title = "Implement User Authentication"
+        mock_issue_data.body = "Add user login and registration"
+        mock_issue_data.labels = ["python", "security"]
+        mock_issue_data.checklist = [
+            ChecklistItem(text="Create login form", completed=False),
+            ChecklistItem(text="Add password hashing", completed=False),
+        ]
+        mock_issue_data.get_todo_items.return_value = [
+            "Create login form",
+            "Add password hashing"
+        ]
+        mock_issue_data.requirements = ["Must be secure", "Must be fast"]
+        mock_issue_data.acceptance_criteria = []
+        mock_issue_data.suggested_files = []
+        mock_issue_data.suggested_directories = []
+        mock_issue_data.repository = "user/repo"
+        mock_issue_data.author = "testuser"
+        mock_issue_data.created_at = "2024-01-01T00:00:00"
+
+        mock_parser_instance = Mock()
+        mock_parser_instance.parse_issue.return_value = mock_issue_data
+        mock_parser_instance.detect_language.return_value = "python"
+        mock_parser.return_value = mock_parser_instance
+
+        mock_engine = Mock()
+        mock_engine.load_templates.return_value = {
+            "main.py": "# content",
+            "utils.py": "# utils"
+        }
+        mock_engine.get_template_context.return_value = {
+            "project_name": "implement-user-authentication",
+            "issue_number": 42
+        }
+        mock_tpl_engine.return_value = mock_engine
+
+        mock_code_gen_instance = Mock()
+        mock_code_gen_instance.generate_all_files.return_value = []
+        mock_code_gen.return_value = mock_code_gen_instance
+
+        mock_struct_gen_instance = Mock()
+        mock_struct_gen.return_value = mock_struct_gen_instance
+
+        with runner.isolated_filesystem():
+            result = runner.invoke(
+                cli,
+                [
+                    "generate",
+                    "https://github.com/user/repo/issues/42",
+                    "--language", "python",
+                    "--output", "./test-project"
+                ]
+            )
+
+            assert result.exit_code == 0
+
+    def test_template_engine_with_real_templates(self):
+        """Test TemplateEngine with real built-in templates."""
+        engine = TemplateEngine()
+
+        languages = engine.list_available_languages()
+        assert "python" in languages
+        assert "javascript" in languages
+        assert "go" in languages
+        assert "rust" in languages
+
+        python_templates = engine.list_available_templates("python")
+        assert "default" in python_templates
+
+    def test_issue_data_integration(self):
+        """Test IssueData with real checklist items."""
+        checklist = [
+            ChecklistItem(text="First task", completed=False),
+            ChecklistItem(text="Second task", completed=True),
+            ChecklistItem(text="Third task", completed=False),
+        ]
+
+        issue_data = IssueData(
+            number=100,
+            title="Integration Test Issue",
+            body="Test body for integration",
+            body_html="<p>Test body</p>",
+            labels=["test"],
+            state="open",
+            url="https://github.com/test/repo/issues/100",
+            repository="test/repo",
+            author="testuser",
+            created_at="2024-01-01T00:00:00",
+            updated_at="2024-01-02T00:00:00",
+            checklist=checklist
+        )
+
+        todos = issue_data.get_todo_items()
+        completed = issue_data.get_completed_items()
+
+        assert len(todos) == 2
+        assert len(completed) == 1
+        assert "First task" in todos
+        assert "Second task" in completed
+
+    def test_generator_with_real_templates(self):
+        """Test code generation with real templates."""
+        issue_data = IssueData(
+            number=1,
+            title="Test Python Project",
+            body="",
+            body_html="",
+            labels=["python"],
+            state="open",
+            url="",
+            repository="",
+            author="",
+            created_at="",
+            updated_at="",
+            checklist=[
+                ChecklistItem(text="Task 1", completed=False),
+                ChecklistItem(text="Task 2", completed=False),
+            ]
+        )
+
+        engine = TemplateEngine()
+        gen = CodeGenerator(engine, issue_data)
+
+        files = gen.generate_all_files("python", issue_data)
+
+        assert len(files) > 0
+        for f in files:
+            assert f.path is not None
+            assert f.content is not None
+
+    def test_structure_generator_preview_mode(self):
+        """Test structure generator in preview mode."""
+        issue_data = IssueData(
+            number=1,
+            title="Preview Test",
+            body="",
+            body_html="",
+            labels=["python"],
+            state="open",
+            url="",
+            repository="",
+            author="",
+            created_at="",
+            updated_at="",
+            checklist=[]
+        )
+
+        engine = TemplateEngine()
+        code_gen = CodeGenerator(engine, issue_data)
+
+        with tempfile.TemporaryDirectory() as tmpdir:
+            gen = StructureGenerator(output_dir=tmpdir, preview=True)
+            gen.generate("python", issue_data, code_gen)
+
+            assert len(gen.created_files) == 0
+            assert len(gen.created_dirs) == 0
+
+    def test_multiple_language_templates(self):
+        """Test that all language templates can be loaded."""
+        engine = TemplateEngine()
+
+        for lang in ["python", "javascript", "go", "rust"]:
+            templates = engine.list_available_templates(lang)
+            assert len(templates) >= 1
+
+            context = engine.get_template_context(
+                IssueData(
+                    number=1, title="Test", body="", body_html="",
+                    labels=[lang], state="open", url="", repository="",
+                    author="", created_at="", updated_at=""
+                )
+            )
+            assert context is not None
+
+    def test_cli_with_preview_flag(self):
+        """Test CLI with preview flag doesn't create files."""
+        runner = CliRunner()
+
+        with patch('scaffoldforge.cli.commands.IssueParser') as mock_parser, \
+             patch('scaffoldforge.cli.commands.TemplateEngine') as mock_tpl_engine, \
+             patch('scaffoldforge.cli.commands.StructureGenerator') as mock_struct_gen, \
+             patch('scaffoldforge.cli.commands.CodeGenerator') as mock_code_gen:
+
+            mock_issue_data = Mock()
+            mock_issue_data.number = 1
+            mock_issue_data.title = "Test"
+            mock_issue_data.labels = ["python"]
+            mock_issue_data.checklist = []
+            mock_issue_data.get_todo_items.return_value = []
+            mock_issue_data.requirements = []
+            mock_issue_data.body = ""
+            mock_issue_data.repository = ""
+            mock_issue_data.author = ""
+            mock_issue_data.created_at = ""
+
+            mock_parser.return_value.parse_issue.return_value = mock_issue_data
+            mock_parser.return_value.detect_language.return_value = "python"
+
+            with runner.isolated_filesystem():
+                result = runner.invoke(
+                    cli,
+                    ["generate", "https://github.com/test/repo/issues/1", "--preview"]
+                )
+
+                assert result.exit_code == 0
+
+    def test_readme_generation(self):
+        """Test README generation in structure generator."""
+        issue_data = IssueData(
+            number=123,
+            title="Test Project",
+            body="This is a test project body",
+            body_html="",
+            labels=["python"],
+            state="open",
+            url="https://github.com/user/repo/issues/123",
+            repository="user/repo",
+            author="testuser",
+            created_at="2024-01-01T00:00:00",
+            updated_at="2024-01-02T00:00:00",
+            checklist=[
+                ChecklistItem(text="Task 1", completed=False),
+                ChecklistItem(text="Task 2", completed=True),
+            ]
+        )
+
+        engine = TemplateEngine()
+        code_gen = CodeGenerator(engine, issue_data)
+
+        with tempfile.TemporaryDirectory() as tmpdir:
+            gen = StructureGenerator(output_dir=tmpdir, preview=False)
+            gen.generate("python", issue_data, code_gen)
+
+            readme_path = Path(tmpdir) / "test-project" / "README.md"
+            if readme_path.exists():
+                content = readme_path.read_text()
+                assert "Test Project" in content
+                assert "123" in content
+
+
+class TestRepositoryIntegration:
+    """Tests for repository integration features."""
+
+    def test_gitignore_content_by_language(self):
+        """Test that gitignore content varies by language."""
+        issue_data = IssueData(
+            number=1, title="Test", body="", body_html="",
+            labels=[], state="open", url="", repository="",
+            author="", created_at="", updated_at=""
+        )
+
+        engine = TemplateEngine()
+        code_gen = CodeGenerator(engine, issue_data)
+
+        for lang in ["python", "javascript", "go", "rust"]:
+            files = code_gen.generate_all_files(lang, issue_data)
+            file_names = [f.path for f in files]
+
+            if lang == "python":
+                assert any("requirements" in f or "pyproject" in f for f in file_names)
+            elif lang == "javascript":
+                assert any("package.json" in f for f in file_names)
+            elif lang == "go":
+                assert any("go.mod" in f for f in file_names)
+            elif lang == "rust":
+                assert any("Cargo.toml" in f for f in file_names)